Association between the speaking space of /s/ sound and incisal overlaps in dentate and edentate subjects

Abstract

RESUMOwww.fob.usp.br/revista or www.scielo.br/jaos he purpose of this study is to determine the association of speaking space of /s/ sound with vertical and horizontal overlaps for two subject groups. Group I comprised 61 subjects with complete permanent dentition and Group II comprised 33 complete denture wearers. They had their mandibular movement determined by using an electromagnetic method. Speaking space of /s/ was obtained from each subject as they were instructed to say the word 'seis' three times. The mean interocclusal distance during /s/ production was considered the speaking space of /s/. Vertical and horizontal incisor overlaps were also measured. The mean value of speaking space of /s/ was 2.22 mm (± 1.38) for Group I and 2.61 mm (± 1.53) for Group II. In Group I, significant correlations were found between the speaking space of /s/ and vertical overlap (r=0.36, P<0.01), and between speaking space of /s/ and horizontal overlap (r=0.45, P<0.01). In Group II, no significant correlation was found between speaking space of /s/ and the overlaps. It was concluded that incisor overlap had a direct influence on the measure of speaking space of /s/ for dentate subjects, but this association was not present for complete denture wearers. Uniterms: Phonetics; Dental occlusion; Complete denture; Jaw relation record. objetivo deste estudo foi determinar a associação do espaço de pronúncia do som /s/ com os trespasses vertical e horizontal em dois grupos de indivíduos. O Grupo I foi formado por 61 indivíduos com dentição permanente completa e o Grupo II por 33 usuários de próteses totais. Todos tiveram seus movimentos mandibulares determinados por um método eletromagnético. O espaço de pronúncia do /s/ foi obtido em cada indivíduo conforme eram instruídos a dizer a palavra 'seis' por três vezes. A distância interoclusal média durante a produção do /s/ foi considerada como sendo o espaço de pronúncia do /s/. Os trespasses incisais vertical e horizontal também foram mensurados. Os valores médios do espaço de pronúncia do /s/ foram 2.22 mm (± 1.38) para o Grupo I e 2.61 mm (± 1.53) para o Grupo II. Para o Grupo I, observou-se associação entre o espaço de pronúncia do /s/ e os trespasses vertical (r=0.36, P<0.01) e horizontal (r=0.45, P<0.01). Para o Grupo II, não foi encontrada nenhuma correlação significante entre o espaço de pronúncia do /s/ e os trespasses. Concluiu-se que o trespasse incisal teve influência direta sobre as medidas do espaço de pronúncia do /s/ em indivíduos dentados, mas esta associação não esteve presente nos usuários de próteses totais. Unitermos: Fonética; Oclusão dentária; Prótese total; Registro da relação maxilomandibular. ASSOCIATION BETWEEN THE SPEAKING SPACE OF /S/ SOUND AND INCISAL OVERLAPS IN DENTATE AND EDENTATE SUBJECTS ASSOCIAÇÃO ENTRE O ESPAÇO DE PRONÚNCIA DO SOM /S/ E OS TRESPASSES INCISAIS EM INDIVÍDUOS DENTADOS E EDENTADOS 413J Appl Oral Sci. 2005;13(4):413-7

Analysis of /s/ sound acoustic characteristics and mandibular speech movements in aesthetic restoration: a case series evaluation

“…Studies demonstrated /s/ is the most frequently distorted when malocclusions or insertion of a prosthodontic restoration in the anterior region of the arch [21][22][23][24]. It also has been con rmed the central incisor position and inclination angle affect the production of the fricative consonant /s/ [11][12][13]. However, the impact of xed restoration on the changes of fricative acoustic features and speech movement behavior was not well illustrated [25].…”

“…In addition, our results indicated overbite was positively correlated with the fricative length of the initial consonant in /Si/ and /Su/ syllable, and overjet was positively correlated with the fricative length of the /San/ syllable. Because the fricative length of /s/ sound is related to the size of the gap between the pronouncing organs, the smaller the gap, the longer the length is, and vice versa [12]. It is preliminarily conjectured that the increase of overbite or overjet may cause a decrease gap in the narrow area of the air ow during production of /s/, resulting in an increase in the fricative length and a stronger friction, which may show non-speci c characteristics of /s/ sound if it exceeds a certain range.…”

“…Incisor overlap is a fundamental feature of anterior prosthetic restorations and cannot be simply complemented by aesthetics and occlusion standards as they are mostly achieved. It has been found that incisor overlap had a direct in uence on pronunciation [11][12][13], especially producing consonants like /s/ sound via obstructing and modifying the air ow. Therefore, it is necessary to clarify the relationship between overlaps of anterior restoration and pronunciation.…”

Influence of pontic design of anterior fixed dental prosthesis on speech: A clinical case study

“…During the pronunciation of consonants, the airflows in the oral cavity must be modified by different kinds of obstruct and friction, so the morphology and relative positions of the tongue, teeth, and lip are crucial for the consonant production[ 16 , 17 ]. For instance, when producing /s/ sound, the tongue is commonly at a higher position and the maxillary and mandibular incisors should form a narrow space, which can compress the airflow at a high speed[ 11 , 18 ]. In this study, when wearing FDPs, the anterior dental arc, the height of teeth, and the vestibular-oral diameter of pontic were changed, which might be difficult for the patient to accurately attain a right tongue position and narrow teeth space in a short term.…”